Back frame and backlight system

ABSTRACT

The present invention provides a back frame of flat panel display device, which includes primary assembling pieces, secondary assembling pieces, and a bracing piece for fixing a circuit board. The primary assembling pieces have a number of at least two, and the at least two primary assembling pieces are connected through joining to form a main frame structure of the back frame. The secondary assembling pieces are joined to the primary assembling pieces. According to practical needs of the main frame structure, different materials are used for different parts at different locations. The back frame is provided with the bracing piece for fixing a circuit board, and the bracing piece includes a bracing body, a first suspension section, a first bearing section, and a first resilient bent section. The present invention also provides a backlight system. The back frame and the backlight system of the present invention have a back frame having a simple structure, overcome the problem that a circuit cannot be easily fixed, reduce the expenditure of a back frame mold, and save the material used for back frame so as to lower down the cost of flat panel display device.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of displaying techniques, andin particular to a back frame of a flat panel display device and abacklight system.

2. The Related Arts

The state-of-the-art liquid crystal display device comprises a frontbezel, a panel, and a backlight module, of which the backlight modulecomprises a back frame, a reflector plate, a light guide, and a lightingassembly.

Currently, a variety of display panels of different sizes are availablein the market to meet different needs of general consumers. For example,in the field of television set, the sizes of liquid crystal panelsinclude 31.5, 42, 46, 48, and 55 inches. Different back frame molds areprovided for liquid crystal planes of different sizes.

Referring to FIG. 1, FIG. 1 is a schematic view showing a conventionalback frame of liquid crystal display device. As shown in FIG. 1, theconventional back frame 10 is a unitary back frame, and it is often thata unitary back frame 10 is made with metal stamping or plastic injectionmolding. The unitary back frame 10 consumes much material and has a highmaterial cost. Further, a large-sized back frame 10 requires large-sizedstamping equipment, and the size of mold corresponding to such a backframe 10 is large and the structure complicated, making the expenditureof the back frame mold high. As a consequence, the conventional backframe is of a high cost.

Further, aluminum or galvanized steel are commonly used as raw materialfor backlight module and is subjected to stamping to make a unitary backpanel. Aluminum has better performance of heat dissipation and isadvantageous in extending lifespan of product. Galvanized steel hasworse performance of heat dissipation, but the price is relatively low.In the cost of a back panel, the material cost takes the greatestpercentage. If the whole back panel is made of aluminum material, thenthe cost is extremely high and the structural strength is poor. If it iscompletely made of galvanized steel plates, then the heat dissipationwill be poor and the product performance will be deteriorated. Thus, itis an important issue of the technology to ensure product quality andsave material cost in order to lower down the overall product cost.

SUMMARY OF THE INVENTION

The technical issue to be addressed by the present invention is toprovide a back frame and a backlight system, which lower material costand mold cost and overcome the problem that a circuit board cannot beeasily fixed.

To address the above technical issue, the present invention adopts atechnical solution that provides a back frame of flat panel displaydevice, which comprises primary assembling pieces, secondary assemblingpieces, and a bracing piece for fixing a circuit board; the primaryassembling pieces have a number of at least two, the at least twoprimary assembling pieces being connected through joining to form a mainframe structure of the back frame, the secondary assembling pieces beingjoined to the main frame structure; the at least two primary assemblingpieces comprise a primary assembling piece that has a heat sourcearranged thereon, the primary assembling piece that has the heat sourcearranged thereon having a first heat transfer capability, the remainingone or more primary assembling pieces of the at least two primaryassembling pieces that have no heat source arranged thereon having asecond heat transfer capability, the first heat transfer capabilitybeing greater than the second heat transfer capability; and the bracingpiece is provided for fixing a circuit board, the bracing piececomprising a bracing body, a first suspension section, a first bearingsection, and a first resilient bent section, the bracing body beingfixed to the primary assembling pieces or the secondary assemblingpieces or both of the primary assembling pieces and the secondaryassembling pieces, the first suspension section extending from thebracing body toward one side of the bracing body, the first bearingsection being spaced from the bracing body and extending from the firstsuspension section toward one side of the first suspension section, thefirst resilient bent section being located between the first bearingsection and the bracing body and being bent from the first suspensionsection toward one side of the first suspension section, the firstbearing section and the first resilient bent section resilientlyclamping a first side edge of the circuit board

According to a preferred embodiment of the present invention, theprimary assembling piece that has the heat source arranged thereon has afirst strength, the remaining one or more primary assembling pieces ofthe at least two primary assembling pieces that have no heat sourcearranged thereon having a second strength, the second strength beinggreater than the first strength.

According to a preferred embodiment of the present invention, theprimary assembling piece that has the first heat transfer capability andthe first strength is an aluminum piece and the primary assemblingpieces that have the second heat transfer capability and the secondstrength are galvanized steel pieces.

According to a preferred embodiment of the present invention, thebracing piece further comprises a second suspension section, a secondbearing section, and a second resilient bent section, the secondsuspension section being spaced from the first suspension section andextending from the bracing body toward one side of the bracing body, thesecond bearing section being spaced from the bracing body and extendingfrom the second suspension section toward one side of the secondsuspension section, the second resilient bent section being locatedbetween the second bearing section and the bracing body and extendingfrom the second suspension toward one side of the second suspensionsection, the second bearing section and the second resilient bentsection resiliently clamping a second side edge of the circuit boardthat is opposite to the first side edge.

According to a preferred embodiment of the present invention, the backframe comprises two bracing pieces and the two bracing pieces are spacedfrom each other to clamp different locations of the first side edge andthe second side edge of the circuit board, the bracing body being ofstep-like configuration and bridging between the two assembling pieces.

According to a preferred embodiment of the present invention, the atleast two primary assembling pieces comprise a first primary assemblingpiece and a second primary assembling piece that are joined to eachother, wherein the first primary assembling piece has an end having asurface forming at least joint sections that are arranged to space fromeach other in a lengthwise direction of the first primary assemblingpiece, the first primary assembling piece using one of the jointsections thereof to join a corresponding end of the second primaryassembling piece in order to form a main frame structure of the backframe having different sizes.

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in a surface of the first primaryassembling piece and having a shape corresponding to the end of thesecond primary assembling piece for receiving the end of the secondprimary assembling piece.

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in the surface of the first primaryassembling piece, the second primary assembling piece having an endhaving a surface forming protrusions at corresponding positions that arearranged to space from each other in a lengthwise direction of thesecond primary assembling piece, the protrusions being receivable in therecesses to join the first primary assembling piece and the secondprimary assembling piece to each other.

According to a preferred embodiment of the present invention, the backframe comprises a third primary assembling piece and a fourth primaryassembling piece; and the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece are connected to each other in a leadingend-to-tailing end manner through screwing, fastening or welding to forma rectangular main frame structure of the back frame.

According to a preferred embodiment of the present invention, the backframe comprises secondary assembling pieces arranged in the main framestructure, the secondary assembling pieces being joined to the mainframe structure.

According to a preferred embodiment of the present invention, thesecondary assembling pieces comprise a first secondary assembling pieceand a second secondary assembling piece, the first secondary assemblingpiece having two ends respectively joined to at least two primaryassembling pieces of the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece, the second secondary assembling piecehaving two ends respectively joined to at least two primary assemblingpieces of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, and the fourthprimary assembling piece.

According to a preferred embodiment of the present invention, the twoends of the first secondary assembling piece are respectively joined tothe first primary assembling piece and the second primary assemblingpiece that are adjacent to each other and the two ends of the secondsecondary assembling piece are respectively joined to the third primaryassembling piece and the fourth primary assembling piece that areadjacent to each other; or the two ends of the first secondaryassembling piece are respectively joined to the first primary assemblingpiece and the third primary assembling piece that are opposite to eachother and the two ends of the second secondary assembling piece arerespectively joined to the first primary assembling piece and the thirdprimary assembling piece that are opposite to each other.

To address the above technical issue, the present invention adopts atechnical solution that provides a backlight system, which comprises alight source, a light homogenization mechanism, and a back frame; andthe back frame carries the light source and the light homogenizationmechanism, the back frame being any back frame described above.

According to a preferred embodiment of the present invention, the lightsource comprises an LED light source, thermal silicone rubber beingprovided between the LED light source and the primary assembling piecethat carries the LED light source.

The efficacy of the present invention is that to be distinguished fromthe state of the art, the present invention provides a back frame and abacklight system that use at least two primary assembling pieces ofwhich a primary assembling piece that has a heat source arranged thereonhas a heat transfer capability greater than the remaining one or moreprimary assembling pieces that have no heat source arranged thereon,based on which different materials are selected to ensue the need ofheat dissipation while lowering the material cost. Further, a joinedback frame is used so as to reduce the expenditure of a back frame moldand save the material used for back frame so as to lower down the costof flat panel display device. Further, a bracing piece that comprises abracing body, a first suspension section, a first bearing section, and afirst resilient bent section is used to fix a circuit board, so as toovercome the problem that the circuit is cannot be easily fixed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a conventional back frame of liquidcrystal display device;

FIG. 2 is a schematic view showing a flat panel display device accordingto a first embodiment of the present invention;

FIG. 3 is a schematic view showing a back frame of a flat panel displaydevice according to a second embodiment of the present invention;

FIG. 4 is a schematic view showing a back frame of a flat panel displaydevice according to a third embodiment of the present invention;

FIG. 5 is a schematic view showing a back frame of a flat panel displaydevice according to a fourth embodiment of the present invention;

FIG. 6 is a cross-sectional view showing a joining structure of twoprimary assembling pieces of a flat panel display device according to afifth embodiment of the present invention;

FIG. 7 is a schematic view showing a diagonally-arranged first secondaryassembling piece mounted to a main frame structure of a flat paneldisplay device according to a sixth embodiment of the present invention;

FIG. 8 is a schematic view showing a first secondary assembling pieceand a second secondary assembling piece mounted to a main framestructure of a flat panel display device according to a seventhembodiment of the present invention;

FIG. 9 is a schematic view showing joint sections of a back frame of aflat panel display device according to an eighth embodiment of thepresent invention;

FIG. 10 is a cross-sectional view showing a first embodiment of jointsection of FIG. 9;

FIG. 11 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aninth embodiment of the present invention;

FIG. 12 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to atenth embodiment of the present invention;

FIG. 13 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aneleventh embodiment of the present invention;

FIG. 14 is a schematic view showing a joint section of a back frame of aflat panel display device according to a twelfth embodiment of thepresent invention;

FIG. 15 is a schematic view showing a joint section of a back frame of aflat panel display device according to a thirteenth embodiment of thepresent invention;

FIG. 16 is a schematic view showing a back frame of a flat panel displaydevice according to a fourteenth embodiment of the present invention;

FIG. 17 is a schematic view showing a flat panel display deviceaccording to a fifteenth embodiment of the present invention;

FIG. 18 is a schematic view showing a portion of a back frame of a flatpanel display device according to a sixteenth embodiment of the presentinvention;

FIG. 19 is a cross-sectional view showing a bracing piece of the backframe of FIG. 18 and a circuit board;

FIG. 20 is a schematic view showing a back frame of flat panel displaydevice according to a seventeenth embodiment of the present invention;

FIG. 21 is a flow chart showing a method for manufacturing a back frameof a flat panel display device according to an eighteenth of the presentinvention;

FIG. 22 is a schematic view showing a flat panel display device with atouch screen according to a nineteenth embodiment of the presentinvention;

FIG. 23 is a schematic view showing a stereoscopic display deviceaccording to a twentieth embodiment of the present invention; and

FIG. 24 is a schematic view showing a plasma display device according toa twenty-first embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 2-3, FIG. 2 is a schematic view showing a flat paneldisplay device according to a first embodiment of the present inventionand FIG. 3 is a schematic view showing a first embodiment of a backframe of a flat panel display device according to a second embodiment ofthe present invention. As shown in FIG. 2, the flat panel display device20 according to the instant embodiment comprises: a backlight system 21and a display panel 22. The backlight system 21 is arranged on a backside of the display panel 22 and supplies light to the display panel 22.

In the instant embodiment, the backlight system 21 comprises a lightsource 25, a light homogenization mechanism 24, and a back frame 23. Theback frame 23 carries the light source 25 and the light homogenizationmechanism 24. When the backlight system 21 is an edge lighting type, thelight homogenization mechanism 24 is a light guide; and when thebacklight system 21 is a direct type, the light homogenization mechanism24 is a diffuser plate. The back frame 23 comprises at least a firstprimary assembling piece and a second primary assembling piece, and thetwo of at least first and second primary assembling pieces constitute amain frame structure 27 of the back frame 23.

Referring also to FIG. 3, the back frame 23 of the first embodimentcomprises a first primary assembling piece 261 and a second primaryassembling piece 262. The first primary assembling piece 261 has an endjoined to an end of the second primary assembling piece 262, and thefirst primary assembling piece 261 has another end joined to another endof the second primary assembling piece 262 in order to form the mainframe structure 27 of the back frame 23. The first primary assemblingpiece 261 and the second primary assembling piece 262 are both aluminumpieces or galvanized steel pieces. In the instant embodiment, the firstprimary assembling piece 261 and the second primary assembling piece 262are L-shaped.

Referring also to FIG. 4, the back frame 23 of a third embodimentcomprises a first primary assembling piece 281, a second primaryassembling piece 282, and a third primary assembling piece 283. Thethree primary assembling pieces 281, 282, and 283 are assembled andjoined to form a main frame structure 27 of the back frame 23. The threeprimary assembling pieces 281, 282, and 283 are all aluminum pieces orgalvanized steel pieces. An end of the first primary assembling piece281 is joined to an end of the second primary assembling piece 282.Another end of the primary assembling piece 282 is joined to an end ofthe third primary assembling piece 283. Another end of the third primaryassembling piece 282 is joined to another end of the first primaryassembling piece 281.

In the instant embodiment, the first primary assembling piece 281 isL-shaped, and the second and third primary assembling pieces 282, 283are straight linear.

Further, the back frame 23 further comprises secondary assembling piecesarranged inside and joined to the main frame structure 27.

A detailed description will be given to the back frame 23 of the flatpanel display device 20 according to the present invention, whichcomprises four primary assembling pieces and two secondary assemblingpieces.

Referring to FIG. 5, FIG. 5 is a schematic view showing a back frame offlat panel display device according to a fourth embodiment of thepresent invention. As shown in FIG. 5, in the instant embodiment, a backframe 23 comprises: a first primary assembling piece 231, a secondprimary assembling piece 232, a third primary assembling piece 233, afourth primary assembling piece 234, a first secondary assembling piece235, a second secondary assembling piece 236, and bracing pieces 2371,2372, 2373, 2374, 2375, 2376, and 2377. The first primary assemblingpiece 231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234 arejoined to each other in a leading end-to-tailing end manner toconstitute a rectangular main frame structure 27 of the back frame 23.The first secondary assembling piece 235 and the second secondaryassembling piece 236, serving as ancillary assembling pieces, arearranged in the main frame structure 27 and joined to the main framestructure 27.

Specifically, an end of the first primary assembling piece 231 is joinedto an end of the second primary assembling piece 232, another end of thesecond primary assembling piece 232 is joined to an end of the thirdprimary assembling piece 233, another end of the third primaryassembling piece 233 is joined to an end of the fourth primaryassembling piece 234, and another end of the fourth primary assemblingpiece 234 is joined to another end of the first primary assembling piece231 in order to form the rectangular main frame structure 27. The firstprimary assembling piece 231, the second primary assembling piece 232,the third primary assembling piece 233, and the fourth primaryassembling piece 234 are all aluminum pieces or galvanized steel pieces.In the instant embodiment, the first primary assembling piece 231, thesecond primary assembling piece 232, the third primary assembling piece233, and the fourth primary assembling piece 234 are straight linear,yet in other embodiments, it is apparent to those skilled in the art tomake all the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, and thefourth primary assembling piece 234 L-shaped, or some being straightlinear and the remaining being L-shaped. For example, in FIG. 3, thefirst primary assembling piece 261 and the second primary assemblingpiece 262 are both L-shaped; in FIG. 15, the first primary assemblingpiece 281 is L-shaped, while the second and third primary assemblingpieces 282 and 283 are straight linear.

Referring to FIG. 6, FIG. 6 is a cross-sectional view showing a joiningstructure of two primary assembling pieces of a flat panel displaydevice according to a fifth embodiment of the present invention. In theinstant embodiment, the back frame 23 of the flat panel display device20 is formed by joining connection. As shown in FIG. 6, an illustrativeexample is given for the connection of an end of the first primaryassembling piece 231 to an end of the second primary assembling piece232, wherein the end of the second primary assembling piece 232 isjoined to the end of the first primary assembling piece 231 by means offor example screwing, fastening, or welding, to have the end of thesecond primary assembling piece 232 connected to the end of the firstprimary assembling piece 231.

Referring to FIG. 7, FIG. 7 is a schematic view showing adiagonally-arranged first secondary assembling piece mounted to a mainframe structure of a flat panel display device according to a sixthembodiment of the present invention. In the instant embodiment, thefirst secondary assembling piece 235 and the second secondary assemblingpiece 236 are arranged in the main frame structure 27 of the back frame23. An end of the first secondary assembling piece 235 is joined to thefirst primary assembling piece 231 and another end of the firstsecondary assembling piece 235 is joined to the third primary assemblingpiece 233; and an end of the second secondary assembling piece 236 isjoined to the first primary assembling piece 231 and another end of thesecond secondary assembling piece 236 is joined to the third primaryassembling piece 233. Further, the second primary assembling piece 232,the fourth primary assembling piece 234, the first secondary assemblingpiece 235, and the second secondary assembling piece 236 are arrangedparallel to each other. In other embodiments, those skilled in the artmay arrange at least one secondary assembling piece in the main framestructure 27. For example, only the first secondary assembling piece 235is arranged in the main frame structure 27. Further, the two ends of thefirst secondary assembling piece 235 can be selectively joined to atleast two of the primary assembling pieces of the first primaryassembling piece 231, the second primary assembling piece 232, the thirdprimary assembling piece 233, and the fourth primary assembling piece234. For example, the first secondary assembling piece 235 is setdiagonally in the main frame structure 27, as shown in FIG. 7.Similarly, the two ends of the second secondary assembling piece 236 canbe selectively joined to at least two of the primary assembling piecesof the first primary assembling piece 231, the second primary assemblingpiece 232, the third primary assembling piece 233, and the fourthprimary assembling piece 234.

Referring to FIG. 8, FIG. 8 is a schematic view showing a firstsecondary assembling piece and a second secondary assembling piecemounted to a main frame structure of a flat panel display deviceaccording to a seventh embodiment of the present invention. For example,the two ends of the first secondary assembling piece 235 arerespectively joined to the first primary assembling piece 231 and thesecond primary assembling piece 232 that are adjacent to each other andthe two ends of the second secondary assembling piece 236 arerespectively joined the third primary assembling piece 233 and thefourth primary assembling piece 234 that are adjacent to each other.

In the instant embodiment, the back frame 23 comprises seven bracingpieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377. The bracing piece2371 is fixed to the fourth primary assembling piece 234; the bracingpieces 2372, 2373 are both fixed to the first secondary assembling piece235; the bracing piece 2374 is fixed to the second secondary assemblingpiece 236; the bracing piece 2375 is fixed to the second primaryassembling piece 232; and the bracing pieces 2376, 2377 are each fixed,at two ends thereof, to the first secondary assembling piece 235 and thesecond secondary assembling piece 236. In practice, the bracing piecescan be fixed to one or more of the first primary assembling piece 231,the second primary assembling piece 232, the third primary assemblingpiece 233, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236. Inother embodiments, those skilled in the art may mount bracing pieces ofany other numbers to the back frame 23, such as one or more bracingpieces. Further, the bracing pieces can be releasably fixed to one ormore of the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, the fourthprimary assembling piece 234, the first secondary assembling piece 235,and the second secondary assembling piece 236.

The bracing pieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377 may beprovided with bumps (not labeled) so that the back frame 23 may fixcomponents, such as circuit boards, with such bumps.

Molds for making the back frame 23 will be described. In the instantembodiment, the first primary assembling piece 231 and the third primaryassembling piece 233 are of the same size and shape so that they can bemade by stamping with the same mold. The second primary assembling piece232, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236 areof the same size and shape so that they can be made by stamping with thesame mold, making it possible to share the mold. Thus, the back frame 23of the present invention can be made by stamping with only twosmall-sized molds, and compared to the conventional back frame 10 thatrequires a large-sized mold, the molds for making the back frame 23 ofthe present invention are simple in structure and small in size and thusthe cost of mold for the back frame 23 can be lowered. Further, comparedto the whole back frame structure of the conventional back frame 10, theback frame 23 of the present invention can significantly save materialused and thus reduce the manufacturing cost of the flat panel displaydevice 20.

Referring to FIG. 9, FIG. 9 is a schematic view showing joint sectionsof a back frame of a flat panel display device according to an eighthembodiment of the present invention. As shown in FIG. 9, in the instantembodiment, an end of the first primary assembling piece is providedwith two joint sections, and the joint sections have a structure matingan end of the second primary assembling piece so that the first primaryassembling piece can be joined to a corresponding end of the secondprimary assembling piece.

Specifically, the first primary assembling piece 231 has an end having asurface forming joint sections 2311, 2312, and the joint sections 2311,2312 are arranged in a spaced manner in a lengthwise direction of thefirst primary assembling piece 231. The joint sections 2311, 2312 areformed by forming recesses having a shape mating an end of the secondprimary assembling piece 232 in the first primary assembling piece 231in order to receive the end of the second primary assembling piece 232therein.

Referring to FIG. 10, FIG. 10 is a cross-sectional view showing a firstexample of joint section of FIG. 9. As shown in FIG. 10, the jointsections 2311, 2312 are recesses that do not extend through oppositesurfaces of the end of the first primary assembling piece 231 and therecesses are of a rectangular shape with the second primary assemblingpiece 232 being straight linear.

To assemble a large-sized back frame 23, the joint section 2311 that isclose to the very end of the first primary assembling piece 231 is firsttaken and a second primary assembling piece 232 having a correspondingwidth is selected. Afterwards, an end of the second primary assemblingpiece 232 is positioned in the recess of the joint section 2311. Andthen, means, such as screwing, fastening, or welding, is applied to joinand fix the end of the second primary assembling piece 232 to the jointsection 2311. To assemble a small-sized back frame 23, the joint section2312 that is distant from the very end of the first primary assemblingpiece 231 is first chosen and a second primary assembling piece 232having a corresponding width is selected. Afterwards, an end of thesecond primary assembling piece 232 is positioned in the recess of thejoint section 2312. And then, means, such as screwing, fastening, orwelding, is applied to join and fix the end of the second primaryassembling piece 232 to the joint section 2312.

Referring to FIG. 11, FIG. 11 is a schematic view showing a joiningstructure of a joint section of a back frame of a flat panel displaydevice according to a ninth embodiment of the present invention. Asshown in FIG. 11, to allow of selection of the size of the back frame 23in another direction, for example the second primary assembling piece232 forms a protrusion at a corresponding location on a surface thereof,and the protrusion of the second primary assembling piece 232 isembedded in the recess the first primary assembling piece 231 at acorresponding location in order to join the first primary assemblingpiece 231 and the second primary assembling piece 232. Further, thesecond primary assembling piece 232 may form, on a surface of one endthereof, at least two protrusions that are spaced in the lengthwisedirection of the second primary assembling piece 232, such as two,three, or four protrusions.

Furthermore, as shown in FIG. 12, FIG. 12 is a schematic view showing ajoining structure of a joint section of a back frame of a flat paneldisplay device according to a tenth embodiment of the present invention.The recess of the first primary assembling piece 231 can be a recess ofa multi-stepped configuration and the second primary assembling piece232 forms, at a corresponding location, a protrusion having amulti-stepped configuration corresponding to the recess.

Further, as shown in FIG. 13, FIG. 13 is a schematic view showing ajoining structure of a joint section of a back frame of a flat paneldisplay device according to an eleventh embodiment of the presentinvention. Taking the joint section 2311 as an example, the recess ofthe first primary assembling piece 231 forms, in a bottom thereof, afirst through hole 2313, and the second primary assembling piece 232forms, at a location corresponding to the joint section 2311, a secondthrough hole 2321. The back frame 23 further comprises a fastener 240.The fastener 240 extends through the first through hole 2313 and thesecond through hole 2321 to joint the first primary assembling piece 231and the second primary assembling piece 232 to each other.

As shown in FIG. 14, FIG. 14 is a schematic view showing a joint sectionof a back frame of a flat panel display device according to a twelfthembodiment of the present invention. The recesses of the joint sections2311, 2312 of the first primary assembling piece 231 are of a circularshape. Yet, in other embodiments, those skilled in the art may arrangethe shape of the recesses to be other polygonal configurations, such astriangle.

As shown in FIG. 15, FIG. 15 is a schematic view showing joiningrealized by using different joint sections of a back frame of a flatpanel display device according to a thirteenth embodiment of the presentinvention. In another embodiment of the back frame of flat panel displaydevice according to the present invention, the joint sections 2311, 2312are recesses that extend through opposite surfaces of the first primaryassembling piece 231, whereby an end of the second primary assemblingpiece 232 is movable within the joint sections 2311, 2312. For example,after the end of the second primary assembling piece 232 is setextending beyond and joined and fixed to the joint section 2312, theportion of extension is then trimmed off so that the length of thesecond primary assembling piece 232 that serves as a primary assemblingpiece of the back frame can be adjusted and thus back frames ofdifferent sizes can be obtained.

In a practical application, the other end of the first primaryassembling piece 231 and both ends of the third primary assembling piece233 are all provided with two joint sections having a structureidentical to that of the joint sections 2311, 2312. The ends of thesecond primary assembling piece 232 and the ends of the fourth primaryassembling piece 234 may be subjected to specific designs or no designat all according to different applications. For example:

(1) In a first situation, as shown in FIG. 10, the two ends of thesecond primary assembling piece 232 and the two ends of the fourthprimary assembling piece 234 are of no specific design. In other words,the ends are of the same structure as the remaining portions. Under thiscondition, in making a join with a selected joint section 2311 (2312) atone end of the first primary assembling piece 231 (the same applicableto the other end), if an attempt is made to change the width of the backframe 23, then the length of the corresponding second primary assemblingpiece 232 and fourth primary assembling piece 234 must be selectedaccordingly. Namely, if the joint section 2311 that is close to the veryend of the first primary assembling piece 231 is selected for joining,then no trimming is applied to the second primary assembling piece 232and the fourth primary assembling piece 234 or the portion that istrimmed off is short; if the joint section 2312 that is distant from thevery end of the first primary assembling piece 231 is selected forjoining, then the second primary assembling piece 232 and the fourthprimary assembling piece 234 are trimmed and the trimmed portion beinglong or short is according to the distance that the joint section isfrom the very end of the first primary assembling piece 231 being greator small; and

(2) In a second situation, it is similar to the first situation, but asshown in FIG. 11, the second primary assembling piece 232 and the fourthprimary assembling piece 234 use different protrusions to respectivelymate the first primary assembling piece 231 and the third primaryassembling piece 233 in order to realize change of width of the backframe 23; similarly, if a joint section 2312 other than the first jointsection 2311 that is close to the very end of the first primaryassembling piece 231 is selected for joining, then before or afterjoining, excessive portions of the second primary assembling piece 232and the fourth primary assembling piece 234 may be trimmed off.

This also applicable to an embodiment of the main frame structure 27 ofthe back frame 23 that is formed by only joining two L-shaped primaryassembling pieces.

In summary, the present invention provides a back frame 23 having afirst primary assembling piece that is provided with at least two jointsections. The number of the joint section can be selected according tothe requirement of customers. In the instant embodiment, a descriptionis given to an example comprising two joint sections 2311, 2312. Thus,to prepare the molds for making the back frame 23, only two sets of moldare needed, namely one mold for a first primary assembling piece and theother mold for a second primary assembling piece. The first primaryassembling piece may be provided with a plurality of joint sections forjoining operation in order to form various sizes for the back frame 23.To assemble the back frame 23, based on the desired size of the backframe 23, the corresponding one of the joint sections is selected. Withthe joint section, the second primary assembling piece is joined to thejoint section of the first primary assembling piece and the other jointsection of the first primary assembling piece that is located outward ofthe joining location of the second primary assembling piece is trimmedoff to obtain a desired size of the back frame 23. Compared to theconventional technology that requires different back frame molds formaking different sizes of back frame 10, the back frame of the flatpanel display device 23 according to the present invention requires onlya mold for the first primary assembling piece and a mold for the secondprimary assembling piece 28 so that mold sharing among various sizes ofproduct can be realized and the molds used are of simple structures,allowing of reduction of expenditure of the molds for back frames.

The present invention also provides a mold for making a back frame offlat panel display device. The back frame mold is provided with a mainpattern for forming a primary assembling piece of the back frame and themain pattern comprises a sub-pattern that forms at least two jointsections on an end of the primary assembling piece. The primaryassembling piece comprises the previously discussed first primaryassembling piece and second primary assembling piece, corresponding tothe above mentioned main pattern; and the joint section comprises thepreviously discussed joint section of the first primary assemblingpiece, corresponding to the above mentioned sub-pattern. Repeateddescription is omitted herein.

Referring to FIGS. 16-17, FIG. 16 is a schematic view showing a backframe of a flat panel display device according to a fourteenthembodiment of the present invention and FIG. 17 is a schematic viewshowing a flat panel display device according to a fifteenth embodimentof the present invention. An example of four primary assembling piecesand two secondary assembling pieces will be given to describe thedifference in material section for the primary assembling piece of theback frame 23 of the flat panel display device 20 according to thepresent invention having a heat source arranged thereon and theassembling piece having no heat source arranged thereon.

In the four primary assembling pieces and the two secondary assemblingpieces, at least two primary assembling pieces comprise the primaryassembling piece that has a heat source arranged thereon. The primaryassembling piece that has the heat source arranged thereon has a firstheat transfer capability. The remaining one or more primary assemblingpieces of the at least two primary assembling pieces that have no heatsource arranged thereon have a second heat transfer capability. Thefirst heat transfer capability is greater than the second heat transfercapability.

The heat source can be a light-emitting diode (LED), a printed circuitboard (PCB), or other electronic devices that generate heat. LED istaken an example here. A parameter that represents the heat transfercapability can be thermal conductivity. In other words, the primaryassembling piece that has a heat source arranged thereon has a thermalconductivity that is greater than the thermal conductivity of theremaining one or more primary assembling pieces that have no heat sourcearranged thereon.

The primary assembling piece that has a heat source arranged thereon hasa first strength. The remaining one or more primary assembling pieces ofthe at least two primary assembling pieces that have no heat sourcearranged thereon have a second strength. The second strength is greaterthan the first strength.

The primary assembling piece that has the first heat transfer capabilityand the first strength is an aluminum piece and the primary assemblingpieces that have the second heat transfer capability and the secondstrength are galvanized steel pieces. Certainly, besides aluminumpieces, other pieces having a better capacity of heat dissipation can becopper pieces, magnesium alloys, or open aluminum alloy foams. Besidesgalvanized steel pieces, pieces having a better strength can be organicpieces or tinned iron piece.

An example of back frame that comprises four primary assembling piecesand two secondary assembling pieces will be given as follow. As shown inFIGS. 16-17, a first primary assembling piece 291, a second primaryassembling piece 292, a third primary assembling piece 293, a fourthprimary assembling piece 294, a first secondary assembling piece 295,and a second secondary assembling piece 296 constitute a back frame. Theprimary assembling pieces that have a heat source 25 arranged thereonare the second primary assembling piece 292 and the fourth primaryassembling piece 294. The second primary assembling piece 292 and thefourth primary assembling piece 294 are made of aluminum pieces M1. Thefirst primary assembling piece 291, the third primary assembling piece293, the first secondary assembling piece 295, and the second secondaryassembling piece 296 are made of galvanized steel pieces M2.

Further, the primary assembling piece that has a heat source arrangedthereon can be a stacked structure of a first layer and a second layer,of which the first layer is adjacent to the heat source and the firstlayer has a heat transfer capability that is greater than heat transfercapability of the second layer.

The first layer is adjacent to the heat source and the material of thefirst layer can be selected to have a heat transfer capability greaterthan the heat transfer capability of the material of the second layer.For example, the first layer is an aluminum piece, or a copper piece, ormagnesium alloys, or open aluminum alloy foams, and the second layer isan organic piece or tinned iron. Certainly, the primary assembling piecethat carries the heat source 25 can be of a single layer having amaterial used to make the first layer mentioned above.

Aluminum pieces and copper pieces have better performance of heatdissipation and are advantageous in extending lifespan of product.Galvanized steel has worse performance of heat dissipation, but theprice is relatively low and strength is better. In the cost of a backframe, the material cost takes the greatest percentage. If the wholeback frame is made of a material that has a better performance of heatdissipation, such as aluminum, then the cost is extremely high and thestructural strength is poor. If it is completely made of a materialhaving poor performance of heat dissipation, such as galvanized steel,then the heat dissipation will be poor and the product performance willbe deteriorated. Thus, in practical applications, different parts mustbe manufactured with different materials according to the requirement inorder to minimize the product cost and at the same time ensure therequirements of heat dissipation and strength are satisfied, so that thematerial cost can be reduced and the product cost is lowered. Certainly,the above embodiments of different material selection for the primaryassembling pieces are also applicable to a main frame structure that isformed by joining two L-shaped primary assembling pieces.

Besides using different materials for different parts at differentlocations of the back frame in order to reduce cost, the presentinvention provides a bracing piece on the back frame for fixing acircuit board. The bracing piece comprises a bracing body, a firstsuspension section, a first bearing section, and a first resilient bentsection.

Referring to FIGS. 18 and 19, FIG. 18 is a schematic view showing aportion of a back frame of a flat panel display device according to asixteenth embodiment of the present invention and FIG. 19 is across-sectional view showing a bracing piece of the back frame of FIG.18 and a circuit board. Assembling pieces 71, 72, and 73 are the variousassembling pieces described in the above discussed embodiments,including the primary assembling pieces that are joined to form a mainframe structure or the secondary assembling pieces that are arrangedinside the main frame structure and joined to the main frame structure.A bracing piece 60 comprises a bracing body 61, a first suspensionsection, a first bearing section 63, and a first resilient bent section64. The bracing body 61 is fixed to the assembling pieces 71 and 72. Inthe instant embodiment, the bracing body 61 is of a step-likeconfiguration and bridges between the two assembling pieces 71, 72.However, in backup embodiments of the present invention, the bracingbody 61 can be of a straight bar like configuration or other shapes.Further, the bracing body 61 can be fixed to the assembling piece withonly one end thereof, while the other end is arranged in a suspendingform to simplify mounting process.

The first suspension section 62 extends from the bracing body 61 towardone side of the bracing body 61. The first bearing section 63 is spacedfrom the bracing body 61 and extends from the first suspension section62 toward one side of the first suspension section 62. The firstresilient bent section 64 is located between the first bearing section62 and the bracing body 61 and is bent from the first suspension section63 toward one side of the first suspension section 62. The first bearingsection 63 and the first resilient bent section 64 resiliently clamp afirst side edge of a circuit board 80.

Referring to FIG. 19, the bracing piece 60 further comprises a secondsuspension section 62′, a second bearing section 63′, and a secondresilient bent section 64′. The second suspension section 62′ is spacedfrom the first suspension section 62 and extends from the bracing body61 toward one side of the bracing body 61. The second bearing section63′ is spaced from the bracing body 61 and extends from the secondsuspension section 62′ toward one side of the second suspension section62′. The second resilient bent section 64′ is located between the secondbearing section 63′ and the bracing body 61 and the bracing body 61 andis bent from the second suspension section 62′ toward one side of thesecond suspension section 62′. The second bearing section 63′ and thesecond resilient bent section 64′ resiliently clamp a second side edgeof the circuit board 80 that is opposite to the first side edge. In apreferred embodiment, the first suspension section 62, the first bearingsection 63, and the first resilient bent section 64 and the secondsuspension section 62′, the second bearing section 63′, and the secondresilient bent section 64′ are symmetric with respect to a center lineof the bracing body 61. In a backup embodiment of the present invention,the bracing body 61 of the bracing piece 60 may comprise only the firstsuspension section 62, the first bearing section 63, and the firstresilient bent section 64 for only resiliently clamping the first sideedge of the circuit board 80, and an additional bracing piece that isidentical to the bracing piece 60 is provided to resiliently clamp thesecond side edge of the circuit board 80.

Referring to FIG. 19, after the circuit board 80 is mounted, anelectromagnetic shielding piece 100 is set on the bracing body 61. Theelectromagnetic shielding piece 100 is spaced from the circuit board 80to shield electromagnetic signals generated by the circuit board 80. Theelectromagnetic shielding piece 100 can be a Faraday cage or a metalplate.

Referring to FIG. 18, in the instant embodiment, a bracing piece 90 thatis identical in structure to the bracing piece 60 is further provided.The bracing piece 90 is spaced from the bracing piece 60 to clampdifferent locations of the first and second side edges of the circuitboard 80.

In the instant embodiment, a bracing piece is arranged on the assemblingpiece to fix the circuit board so that the problem that a circuit boardcannot be easily fixed is overcome.

In summary, the present invention provides another back frame of flatpanel display device. Referring to FIG. 20, FIG. 20 is a schematic viewshowing a back frame of flat panel display device according to aseventeenth embodiment of the present invention. A main frame structureof the back frame is formed by joining, in a leading end-to-tailing endmanner, a first primary assembling piece 301, a second primaryassembling piece 302, a third primary assembling piece 303, and a fourthprimary assembling piece 304. A first secondary assembling piece 305 anda second secondary assembling piece 306 have two ends that arerespectively joined to the first primary assembling piece 301 and thethird primary assembling piece 303. The back frame comprises the secondprimary assembling piece 302 and the fourth primary assembling piece 304that have a heat source arranged thereon. The second primary assemblingpiece 302 and the fourth primary assembling piece 304 that have a heatsource arranged thereon have a first heat transfer capability, while theremaining first primary assembling piece 301 and third primaryassembling piece 303 having no heat source arranged thereon have asecond heat transfer capability. The first heat transfer capability isgreater than the second heat transfer capability. The bracing piece 307(as shown in FIGS. 18 and 19) comprises a bracing body, a firstsuspension section, a first bearing section, and a first resilient bentsection. The bracing body is fixed to the second primary assemblingpiece 302 and the second secondary assembling piece 306. The firstsuspension section extends from the bracing body toward one side of thebracing body. The first bearing section is spaced from the bracing bodyand extends from the first suspension section toward one side of thefirst suspension section. The first resilient bent section is locatedbetween the first bearing section and the bracing body and is bent fromthe first suspension section toward one side of the first suspensionsection. The first bearing section and the first resilient bent sectionresiliently clamp a first side edge of the circuit board.

The back frame of the instant embodiment can be a joined back frame asdescribed in any of the previous embodiment. With the bracing piecedescribed above mounted to the assembling pieces of the back frame, theproblem that a circuit board cannot be easily fixed can be overcome.Further, using different materials for different parts according thepractical needs helps reducing the material cost and also improving thestrength of a joining site of the back frame.

The present invention also provides a method for making a back frame offlat panel display device, as shown in FIG. 21. FIG. 21 is a flow chartshowing a method for manufacturing a back frame of a flat panel displaydevice according to an eighteenth embodiment of the present invention.The method comprises the following steps:

Step 501: manufacturing at least two primary assembling pieces, the atleast two primary assembling pieces comprising a primary assemblingpiece that carries a heat source. The primary assembling piece thatcarries the heat source has a first heat transfer capability, and theremaining one or more primary assembling pieces of the at least twoprimary assembling pieces that carry no heat source have a second heattransfer capability, the first heat transfer capability being greaterthan the second heat transfer capability; and

Step 502: joining the at least two primary assembling pieces to form amain frame structure of the back frame, a bracing piece being mounted tothe back frame for fixing a circuit board.

In the instant embodiment, when other joint sections are present betweenthe joining location of the second primary assembling piece and the endof the first primary assembling piece, before or after the step ofselecting one joint section of the at least two joint sections accordingto a size of the back frame to join the corresponding end of the secondprimary assembling piece, the other joint sections of the first primaryassembling piece that are located outward of the joining position of thesecond primary assembling piece are trimmed off. The first primaryassembling piece comprises the previously discussed first primaryassembling piece, and the second primary assembling piece comprises thepreviously discussed second primary assembling piece, and repeateddescription will be omitted herein.

FIG. 22 is a schematic view showing a flat panel display device with atouch screen according to a nineteenth embodiment of the presentinvention. As shown in FIG. 22, the flat panel display device 20 of thepresent invention further comprises a touch screen 29. The touch screen29 is arranged on a light exit surface of the display panel 22 of theflat panel display device 20. The flat panel display device 20comprises: the backlight system 21 and the above discussed display panel22. The backlight system 21 is arranged at the back side of the displaypanel 22 and supplies light to the display panel 22.

The backlight system 21 comprises a light source 25, a lighthomogenization mechanism 24, and a back frame 23. The back frame 23carries the light source 25 and the light homogenization mechanism 24.When the backlight system 21 is an edge lighting type, the lighthomogenization mechanism 24 is a light guide; and when the backlightsystem 21 is a direct type, the light homogenization mechanism 24 is adiffuser plate. The back frame 23 comprises at least a first primaryassembling piece and a second primary assembling piece, and the at leastone first and second primary assembling pieces constitute a main framestructure 27 of the back frame 23.

It is noted that the flat panel display device 20 of the presentinvention can be a liquid crystal display device or a liquid crystaltelevision.

The present invention also provides a stereoscopic display device 30, asshown in FIG. 23. FIG. 23 is a schematic view showing a stereoscopicdisplay device according to a twentieth embodiment of the presentinvention. The stereoscopic display device 30 comprises a liquid crystallens grating 31, a backlight system 32, and a display panel 33. Theliquid crystal lens grating 31 is arranged on a light exit surface ofthe display panel 33. The backlight system 32 can be a backlight systemof any one of the above discussed embodiments, such as the backlightsystem 32 comprising the back frame 23. The back frame 23 comprises atleast first primary assembling piece and the second primary assemblingpiece. The at least first and second primary assembling pieces form amain frame structure of the back frame. Repeated description will beomitted herein.

The present invention also provides a plasma display device 40, as shownin FIG. 24. FIG. 24 is a schematic view showing a plasma display deviceaccording to a twenty-second embodiment of the present invention. Theplasma display device 40 comprises a plasma display panel 41 and a backframe 42. The back frame 42 is arranged at a back side of the displaypanel 41. The back frame 42 can be the back frame of any one of thepreviously discussed embodiments and repeated description will beomitted herein.

With the above discussed manners, the present invention provides a flatpanel display device, a stereoscopic display device, and a plasmadisplay device that have a mold for back frame that is of a simplestructure, reduce the expenditure for mold of back frame, and also savethe material used for back frame so as to lower down the cost of flatpanel display device.

Embodiments of the present invention have been described, but are notintending to impose any undue constraint to the appended claims of thepresent invention. Any modification of equivalent structure orequivalent process made according to the disclosure and drawings of thepresent invention, or any application thereof, directly or indirectly,to other related fields of technique, is considered encompassed in thescope of protection defined by the clams of the present invention.

What is claimed is:
 1. A back frame of a flat panel display device,wherein: the back frame comprises primary assembling pieces, secondaryassembling pieces, and a bracing piece for fixing a circuit board; theprimary assembling pieces have a number of at least two, the at leasttwo primary assembling pieces being connected through joining to form amain frame structure of the back frame, the secondary assembling piecesbeing joined to the main frame structure; the at least two primaryassembling pieces comprise a primary assembling piece that has a heatsource arranged thereon, the primary assembling piece that has the heatsource arranged thereon having a first heat transfer capability, theremaining one or more primary assembling pieces of the at least twoprimary assembling pieces that have no heat source arranged thereonhaving a second heat transfer capability, the first heat transfercapability being greater than the second heat transfer capability; andthe bracing piece is provided for fixing a circuit board, the bracingpiece comprising a bracing body, a first suspension section, a firstbearing section, and a first resilient bent section, the bracing bodybeing fixed to the primary assembling pieces or the secondary assemblingpieces or both of the primary assembling pieces and the secondaryassembling pieces, the first suspension section extending from thebracing body toward one side of the bracing body, the first bearingsection being spaced from the bracing body and extending from the firstsuspension section toward one side of the first suspension section, thefirst resilient bent section being located between the first bearingsection and the bracing body and being bent from the first suspensionsection toward one side of the first suspension section, the firstbearing section and the first resilient bent section resilientlyclamping a first side edge of the circuit board.
 2. The back frame asclaimed in claim 1, wherein: the primary assembling piece that has theheat source arranged thereon has a first strength, the remaining one ormore primary assembling pieces of the at least two primary assemblingpieces that have no heat source arranged thereon having a secondstrength, the second strength being greater than the first strength. 3.The back frame as claimed in claim 2, wherein: the primary assemblingpiece that has the first heat transfer capability and the first strengthis an aluminum piece and the primary assembling pieces that have thesecond heat transfer capability and the second strength are galvanizedsteel pieces.
 4. The back frame as claimed in claim 1, wherein thebracing piece further comprises a second suspension section, a secondbearing section, and a second resilient bent section, the secondsuspension section being spaced from the first suspension section andextending from the bracing body toward one side of the bracing body, thesecond bearing section being spaced from the bracing body and extendingfrom the second suspension section toward one side of the secondsuspension section, the second resilient bent section being locatedbetween the second bearing section and the bracing body and extendingfrom the second suspension toward one side of the second suspensionsection, the second bearing section and the second resilient bentsection resiliently clamping a second side edge of the circuit boardthat is opposite to the first side edge.
 5. The back frame as claimed inclaim 1, wherein the back frame comprises two bracing pieces and the twobracing pieces are spaced from each other to clamp different locationsof the first side edge and the second side edge of the circuit board,the bracing body being of step-like configuration and bridging betweenthe two assembling pieces.
 6. The back frame as claimed in claim 1,wherein: the at least two primary assembling pieces comprise a firstprimary assembling piece and a second primary assembling piece that arejoined to each other, wherein the first primary assembling piece has anend having a surface forming at least joint sections that are arrangedto space from each other in a lengthwise direction of the first primaryassembling piece, the first primary assembling piece using one of thejoint sections thereof to join a corresponding end of the second primaryassembling piece in order to form a main frame structure of the backframe having different sizes.
 7. The back frame as claimed in claim 6,wherein: the joint sections comprise recesses formed in a surface of thefirst primary assembling piece and having a shape corresponding to theend of the second primary assembling piece for receiving the end of thesecond primary assembling piece.
 8. The back frame as claimed in claim6, wherein: the joint sections comprise recesses formed in the surfaceof the first primary assembling piece, the second primary assemblingpiece having an end having a surface forming protrusions atcorresponding positions that are arranged to space from each other in alengthwise direction of the second primary assembling piece, theprotrusions being receivable in the recesses to join the first primaryassembling piece and the second primary assembling piece to each other.9. The back frame as claimed in one of claim 6, wherein: the back framecomprises a third primary assembling piece and a fourth primaryassembling piece; and the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece are connected to each other in a leadingend-to-tailing end manner through screwing, fastening or welding to forma rectangular main frame structure of the back frame.
 10. The back frameas claimed in claim 9, wherein: the secondary assembling pieces comprisea first secondary assembling piece and a second secondary assemblingpiece, the first secondary assembling piece having two ends respectivelyjoined to at least two primary assembling pieces of the first primaryassembling piece, the second primary assembling piece, the third primaryassembling piece, and the fourth primary assembling piece, the secondsecondary assembling piece having two ends respectively joined to atleast two primary assembling pieces of the first primary assemblingpiece, the second primary assembling piece, the third primary assemblingpiece, and the fourth primary assembling piece.
 11. The back frame asclaimed in claim 10, wherein: the two ends of the first secondaryassembling piece are respectively joined to the first primary assemblingpiece and the second primary assembling piece that are adjacent to eachother and the two ends of the second secondary assembling piece arerespectively joined to the third primary assembling piece and the fourthprimary assembling piece that are adjacent to each other; or the twoends of the first secondary assembling piece are respectively joined tothe first primary assembling piece and the third primary assemblingpiece that are opposite to each other and the two ends of the secondsecondary assembling piece are respectively joined to the first primaryassembling piece and the third primary assembling piece that areopposite to each other.
 12. A backlight system, wherein: the backlightsystem comprises a light source, a light homogenization mechanism, and aback frame; and the back frame carries the light source and the lighthomogenization mechanism, the back frame being a back frame claimed inclaim 1, the heat source being a light source.
 13. The backlight systemas claimed in claim 12, wherein: the light source comprises an LED(light-emitting diode) light source, thermal silicone rubber beingprovided between the LED light source and the primary assembling piecethat carries the LED light source.